Esisanwald is a former legal guild turned Dark Guild after the Magic Council banned assassination jobs on which the guild well known for. Eisenwald's Guild Master was arrested and the guild was ordered to disband themselves. However, the members ignored the order. At some point in time, Eisenwald became a subordinate guild to the Oración Seis.
Unlike most Guilds Esisanwald no longer has a Guild Master and is under the control of it's top wizard Erigor. They are also under the control of Oración Seis.
Compared to other organizations in the coalition Esisanwald is not that strong. With only members like Erigor the only expectation. However 8 years ago they nearly wiped majority of Guild masters in Fiore thanks to the flute Lullaby.